Carburetor attachment



Sept. 15, 1931. v. H. BURDICK 4 CARBURETOR ATTACHMENT Filed Feb. 26, 1929 Patented Sept. "15, 1931 PATENT FF'ICE VINCENT H. BURDIGK, OF GARDENA, CALIFORNIA CARBURETOR ATTACHMENT Application filed February 26, 1929. Serial No. 342,731.

This invention relates to internal combustion motors, and whereas it is of utility in connection with any motor of this general class, itis particularly adapted for use in connection with the motors of automobiles.

An object of the invention is the provision of a device adapted to establish a positive seal in the fuel intake of a motor, immediately after the load imposed upon the motor, has been relieved. It should be here pointed out that in the conventional carburetor, the butterfly valve which is operable from the drivers compartment, to control the passage of fuel to the motor, is not adapted to seal the passage through which fuel reaches the motor from the carburetor, the purpose being ot permit a small amount of fuel to pass when the valve is in its extreme closed position, so that the motor can idle. This produces an undesirable condition when the carburetor is used'upon a variable speed motor, because when the load on such a motor is suddenly relieved, the motor is still turning over at a relatively high rate, due to the velocity of its crankshaft and flywheel, and

thus creating a relatively high vacuum in its intake manifold. This draws a much larger quantity of liquid fuel through the carburetor than the carburetor is capable of '30 atomizing, in view of the fact that the passage of such atomized fuel, past the butterfly valve, is restricted. Accordingly, as the motor is slowing down, each of its cylinders is drawing a very highly enriched fuel mixture thereinto. in fact, this fuel mixture is so rich that it is not explosive, and is discharged through the exhaust manifold, as unburned fuel. This not onlyresults in increased cost of the operation of the motor, but it also produces that condition known as gassing wherein a cloud of smoke is discharged from the exhaust.

This condition is particularly noticeable in the case of relatively large trucks and motor busses. When the operator of such a vehicle, is shifting gears, the motor will be run at a relatively high speed, with the low ratio gears enmeshed, and then the load on the motor suddenly relieved while gears of a higher ratio are engaged. This sudden release of the load upon the motor, will result in the discharge of a cloud of foul-smelling gas behind the vehicle, a condition which is particularly undesirable in districts of heav- 11y congested traffic, because of the relatively high percentage of the carbon monoxide and other undesirable gases which are thus expelled to the atmosphere. It is an object of my invention therefore, to provide a device for relieving this undesirable condition.

A further object is the provision of a de vice which is not only capable of taking care of the condition above outlined, but which is also automatically operable to admit pure air to the intake manifold as the motor is decelerating, thus effecting a thorough scavenging of the cylinders of the motor and pre venting any possible damage to the carburetor, owing to the relatively high vacuum which wiuld otherwise be produced in the intake manifold.

A still further object is the provision of means for automatically opening a bypass when the motor has slowed down, permitting the motor to continue operation at idling speed, until the main fuel passageway is again opened to permit the motor to again pick up its load.

A still further object is the provision of a device which is capable of operating efliciently in the performance of the functions above specified, but yet, which is of a very simple nature, with the result that it is relatively inexpensive to manufacture, and is positive in operation.

The invention possesses other objects and advantageous features, some of which, with those enumerated, will be set forth in the following description of the inventions particular embodiment which is illustrated in the drawings accompanying and forming a part of the specification.

Referring to the drawings:

Figure 1 is a vertical, medial sectional View 95 of a device incorporating the features of my invention. T he plane of section is indicated by the line 11 of Fig. 2, and the direction of view by the arrows.

Fig. 2 is a horizontal sectional view taken 10 upon the line 22 of Fig. 1, with the direction of view as indicated.

In terms of broad inclusion, the present invention contemplates a device adapted to be interposed into the fuel intake of a motor, and capable of establishing a positive and tight seal in that fuel intake, when the load on the motor is reduced. Thedevice is also capable of introducing pure air to the fuel intake, as the motor is decelerating after the fuel intake has been thus sealed and is further capable of opening a fuel bypass to permit the motor to idle after it has slowed down to idling speed.

Specifically describing the invention in its preferred embodiment, it is herein shown and described as being interposed between an intake manifold 6 and a carburetor 7, itbeing understood that the manifold 6 communicates with the intake valves of an'internal combustion motor. The device is in the form of a tubular housing 8 having flanges 9 and 11 at opposite ends, by means of which the device may be rigidly attached to the flanges 12 and 13, respectively, of the manifold 6 and carburetor 7, respectively. The housing 8 has a' passage 16 therethrough, normally establishing communication between the bore 17. of themanifold 6 and the throat 18 through which the fuel passes from the carburetor 7. A spider 21 extends across the passage 16 of the housing 8, and is provided with a guide 22 for the stem 23 of a poppet valve 24. A coil spring 26 is under compression between the spider 21 and any suitable form of shoulder 27 rigid with the stem 23. This spring 26 urges the valve 24 upwards toward a seat 28 which is so arranged that when the valve 24 is engaged therewith, the passage. 16 through the housing 8, will be tightly and positively sealed.

The valve 24 is adapted to be opened by a cam '31 which isrigid with a shaft 32 journalled in the housing 8 and extending across the passage 16. An arm 33 rigid with the shaft 32 outside the housing 8, is pivoted to'a control rod 34 which is adapted to be moved longitudinally to effect rotation of the arm 33, and with it, of the cam 31. The rod 34 may be the same rod that is conventionally coupled to the butterfly valve 36 of the carburetor 7, it being understood that when the device of the present invention, is installed, the rod 34 is disconnected from the butterfly valve 36, and connected to the arm 33. The butterfly valve 36 should then be wedged in fully ,open position, as shown, or completely removed.

Preferably a pair of valve cages 37 are rigidly attached to the housing 8 upon opposite sides thereof.- Each cage 37 is provided with avalve seat 38 preferably adjacent the inner end of a passage 39 through the cage 37 communicating with the passage 16 through the housing 8. This passage 39 is phere. A valve 42 is associated with the seat 38 of each of the cages 37, the stem 43 of this valve being slidably mounted within a guide 44 rigid with the cage 37. A coil spring 46 is under compression between the cage 37 and a flange 47 held against longitudinal displacement on the stem 43, by a nut 48 and a lock nut 49. This spring 46 urges the valve 42 outwards against its seat 38, to close the passage 39, it being understood however, that the spring 46 is of such dimensions that the valve 42 is adapted to be unseated inwards, by atmospheric pressure when pressure within the housing 8 is reduced.

Each of the cages 37 also has a relatively small passage 51 therethrough. This passage 51 is adapted to be connected at one end, by means of a tube 52,'to the interior of the housing 8 at any point between the valve seat 28 and the motor. Another tube 53 is adapted to connect the other end of the associated passage 51, to the idling bypass 54 of the carburetor 7. This bypass 54 is conventionally provided with a needle valve 56 operable to restrict the bypass so as to accurately control the passage of fuel therethrough. That end 57 of the bypass 54, which leads into the throat 18 of the carburetor 7, is .closed as by inserting a plug 58 therein, so that the bypass 54 communicates with the motor only through the passages 51 which extend through the cages 37.

Each of these passages 51 is intercepted by the associated valve stem 43 which is provided with a port 61, the parts being so proportioned and arranged that the port 61 is in passage 51, when the valve unseating of the valve 24, is effected as will be readily understood, by the proper positioning of the rod 34 which is connected to the accelerator pedal, and/or the manually operable control lever. When it is desired to relieve the load on the motor, or permit it to slow down for any other'reason, the cam 31 should be so moved that the spring 26 is permitted to seat the valve 24. This, of

course, will result in stopping the flow of any fuel from the carburetor 7, to the motor, which, because of the momentum of its flywheel, will decelerate relatively slowly. As a result, the pressure within the manifold 6 and the housing 8, will be considerably lowered, whereupon the atmospheric pressure acting against the outsideof the valves 42, will unseat these valves, permitting ure air to be drawn into the passage 16 an manifold 6, through the passages 41 and 39. As the deceleration of the motor continues, the low pressure within the housing 16, will be gradually relieved, whereupon the springs 46 will slowly move the valves 42 back to seating position. Thus when the motor has slowed down approximately to idling speed, the ports 61. will be brought into register with the passages 51, whereupon a small quantit of fuel will be, permitted to reach the inta e mani fold from the idling bypass 54c. This quantity should be so regulated by means of the needle valve 56, that the motor is. enabled to idle properly. When it is desired that the motor again pick up its load, or increase its speed, the rod 34 should be activated to unseat the valve 24, whereupon fuel will pass from the carburetor 7 to operate the motor at a speed proportionate with the extent of opening of the valve 24.

It is to be understood that the details of theinvention as herein disclosed, are subject to alteration within the'spirit or scope of the appended claims.

I claim: 7

1. A device of the character described, comprising a tubular housing adapted to be interposed in the fuel intake between a motor and its carburetor, a valve operable to optionally. open .or seal the passage through said housing, a valve seat encircling an aperture inthe side of'said housing, a valve associated with said seat to open inwards and adapted to be opened by atmospheric pressure on the outside of said housing when pressure within the housing is reduced, a

sprin ur 'ng said last mentioned'yalve close, a uel bypass communicating with said housing between said first mentioned valve and said motor, and means for closing said bypass when said last mentioned valve is open. 1

device of the character described, comprising a tubular housing adapted to be interposed in the fuel intake between a motor and its carburetor, a valve cage rigid with the housing and having a passage leading into said housing-between said valve and said motor, an inwardly opening valve mounted in said cage and adapted to close said passage, a spring urging1 said valve closed, a fuel bypass leading t rough said cage and communicating with the passage through the housing, the stem of said valve having a port therethrough in register with said bypass when the valve is seated, and means 0 erable to optionally open or seal the passage t rough said housing between said cageand the carv 'buretor.

In testimony whereof I have signed my name to this specification.

VINCENT H. BURDIGK; 

